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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement [Abstract] |  |  |  |
Revenues | $ 198,547 | $ 172,832 | $ 549,670 | $ 485,936
Operating expenses: |  |  |  |
Cost of operations | 131,273 | 114,118 | 377,707 | 331,527
General and administration | 22,536 | 20,545 | 67,423 | 62,365
Depreciation and amortization | 20,940 | 18,202 | 58,144 | 51,572
Withdrawal costs - multiemployer pension plan | 3,591 | 0 | 3,591 | 0
Expense from acquisition activities and other items | 1,097 | 581 | 2,237 | 930
Southbridge landfill closure charge (settlement), net | 625 | (9,498) | 2,097 | (7,740)
Contract settlement charge | 0 | 0 | 0 | 2,100
Development project charge | 0 | 0 | 0 | 311
Total operating expenses | 180,062 | 143,948 | 511,199 | 441,065
Operating income | 18,485 | 28,884 | 38,471 | 44,871
Other expense (income): |  |  |  |
Interest income | (66) | (53) | (287) | (161)
Interest expense | 6,235 | 6,424 | 18,849 | 19,347
Loss on debt extinguishment | 0 | 0 | 0 | 7,352
Other income | (248) | (166) | (960) | (597)
Other expense, net | 5,921 | 6,205 | 17,602 | 25,941
Income before income taxes | 12,564 | 22,679 | 20,869 | 18,930
Provision (benefit) for income taxes | 178 | 377 | (1,718) | (1,166)
Net income | $ 12,386 | $ 22,302 | $ 22,587 | $ 20,096
Basic earnings per share attributable to common stockholders: |  |  |  |
Weighted average common shares outstanding | 47,690 | 42,779 | 47,029 | 42,605
Basic earnings per common share (in dollars per share) | $ 0.26 | $ 0.52 | $ 0.48 | $ 0.47
Diluted earnings per share attributable to common stockholders: |  |  |  |
Weighted average common shares outstanding | 48,361 | 44,175 | 47,660 | 43,938
Diluted earnings per common share (in dollars per share) | $ 0.26 | $ 0.50 | $ 0.47 | $ 0.46

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration